sedimentary
Chert Arrowhead (Lithic Artifact)
Microcrystalline Quartz (SiO2)
Hardness: 7 on Mohs scale; Color: Tan, brown, and yellowish-orange; Luster: Waxy to dull; Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); High durability.
- Hardness
- 7 on Mohs scale
- Color
- Tan, brown, and yellowish-orange
- Luster
- Waxy to dull
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Physical properties
Hardness: 7 on Mohs scale; Color: Tan, brown, and yellowish-orange; Luster: Waxy to dull; Structure: Cryptocrystalline; Cleavage: None (conchoidal fracture); High durability.
Formation & geological history
Formed as nodules or layers in limestone or chalk through the accumulation of silica-rich organic remains (like sponge spicules) in marine environments. This specimen was anthropogenically worked via flintknapping.
Uses & applications
Historically used for hunting, warfare, and domestic tools; modernly used for archaeological study, museum display, and historical collecting.
Geological facts
This projectile point exhibits 'flaking' scars, evidence of pressure and percussion flaking by humans. Similar shapes are characteristic of the Archaic or Woodland periods in North America, though specific identification depends on the base and notch style.
Field identification & locations
Look for conchoidal (shell-like) fracture patterns and serrated or thinned edges that do not occur naturally. Found globally in areas with sedimentary bedrock. Collectors look for symmetry and lack of damage.
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